Hannover 2016 – scientific programme
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MO: Fachverband Molekülphysik
MO 2: Collisions, Energy transfer and ab initio Modelling
MO 2.3: Talk
Monday, February 29, 2016, 11:30–11:45, f142
Autofragmentation of rovibrational excited metal dimer anions — •Jürgen Göck1, Arno Becker1, Klaus Blaum1, Christian Breitenfeldt1,2, Sebastian George1, Manfred Grieser1, Florian Grussie1, Robert von Hahn1, Philipp Herwig1, Jonas Karthein1, Claude Krantz1, Holger Kreckel1, Sunil Kumar1, Jorrit Lion1, Svenja Lohmann1, Christian Meyer1, Preeti M. Mishra1, Oldrich Novotny1, Aodh P. O’Connor1, Roland Repnow1, Kaija Spruck1,3, Stefan Schippers3, Dirk Schwalm1,4, Lutz Schweikhard2, Stephen Vogel1, and Andreas Wolf1 — 1Max-Planck-Institut für Kernphysik (MPIK), Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Institut für Physik, Ernst Moritz Arndt Universität Greifswald, 17487 Greifswald, Germany — 3I. Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Giessen, Germany — 4Weizmann Institute of Science, Rehovot 76100, Israel
The autofragmentation of Co2− and Ag2− ions was investigated over times up to 1000 s in the Cryogenic Storage Ring (CSR) [1] at the MPIK. The 35 m circumference electrostatic storage ring is operated at cryogenic temperature using liquid helium as cooling agent. The cryogenic environment of below 10 K leading to a residual gas pressure of lower than 10−13 mbar room temperature equivalent offers perfect conditions for background-free gas phase spectroscopy experiments. The rovibrationally excited anions were produced in a metal ion sputter source, accelerated to 60 keV and stored in the CSR. The neutral and charged fragments of the reaction X2*−→X−+X were recorded by micro channel plate based detectors [2] . Results and analysis will be presented. A coincidence signal from auto dissociation of the anions was observed as function of the storage time up to 1000 s. The non-exponential nature of the decay will be presented and compared to earlier short-time measurements [3] . [1] R. von Hahn et al., Nucl. Instrum. Meth. B 269, 2871 (2011) - [2] K. Spruck et al., Rev. Sci. Instrum. 86, 023303 (2015) - [3] J. Fedor et al., Phys. Rev. Lett. 94, 113201 (2005)